I think mathematics is not only a sea tactic, but also a summary. For example, the key to understanding some knowledge points is to master methods, which can not be solved by asking questions about the sea, or by changing numbers. You should sum up what you have learned and say what you are taking when doing the problem and what method should be used to solve it the fastest. In the future, if you encounter this kind of test center, you can directly solve it quickly and accurately by the method you summarized, and you can improve it qualitatively after doing certain questions. Believe you can do it.